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1977 kz650 regulator rectifier upgrade 16 Nov 2022 09:37 #876889

  • vict182
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Hello everyone 

i know its another post about this subject but after reading all the old posts about this and i cant find the answers to my questions

I am speaking about the 1977 kz650 version of generator with field coil system and separate regulator and rectifier

I understood rectifier is quite simple and cheap to build or find online

The regulator is the device i would like to buy cheap, modern and efficient

Is there any out there, maybe meant for other applications, available as direct substitute?

Is there any easy circuit with modern components which is easy to build to replace the mechanical designed in the 70s one?

I understood this regulator should reduce current intensity to the field coil with the raise of current voltage out of the rectifier to keep this voltage below 14.5v. Seems simple. But this is where my electronics knowledge ends.

Last question when thinking of using a modern system is. If i give a fixed in term of intensity amount of current to the field coil, can i then use a modern reg/rec combo meant for a 3phase generator without field coil?

Thanks everyone for any suggest

Cheers from italy

Vic

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1977 kz650 regulator rectifier upgrade 16 Nov 2022 09:44 #876890

  • Nessism
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The field coil design is more advanced than the permanent magnet AC generator.  As you most likely know, though, parts availability is more limited.

One option you have is to convert the system to the permanent magnet type by replacing the engine cover, getting a stator, rotor(?), and a nice R/R (I recommend the SERIES type like a SH775).  In the USA, these parts are dirt cheap, but I’m not sure about in Italy.
Ed

Carburetor O-ring Kits For Sale: Mikuni VM & BS/CV, and Keihin CV34 (as used on KZ750E/H/N/Spectre, 400)

www.kzrider.com/forum/forum-index/faq-wi...owner-things-to-know

1981 KZ750E2
www.kzrider.com/forum/11-projects/604901...z750e-project-thread
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1977 kz650 regulator rectifier upgrade 16 Nov 2022 10:44 #876891

  • gd4now
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I am not enough of an expert to tell you how to make one from scratch. They may well be some here who can. I do know there are some aftermarket locations that do sell more modern versions of regulators for this type of system. There are also some that sell combine units (regulator and rectifier units) for this type of system.
1977 KZ650 B1
Pods and Denco header


This is my Z

OLD KAW OWNERS SMILE ALOT

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1977 kz650 regulator rectifier upgrade 16 Nov 2022 11:18 #876896

  • vict182
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I want to keep the standard generator plus field coil setup

Just want to update the regulator which seems to be the only difficult part

I know there are at least 3 companies in the states which produce those separate or combined parts but with customs and shipping it is almost like buying a nos part

What makes me willing to find a diy solution or a widely available part if used for other applications is that i feel like this regulator with modern components and knowledge is very cheap and easy to build or to find if you know what youre looking for or if you know how to design and assemble easy circuits

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1977 kz650 regulator rectifier upgrade 16 Nov 2022 11:20 #876897

  • Wookie58
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I am not enough of an expert to tell you how to make one from scratch. They may well be some here who can. I do know there are some aftermarket locations that do sell more modern versions of regulators for this type of system. There are also some that sell combine units (regulator and rectifier units) for this type of system.

This is the way that I would go, a modern combined unit that replaces the separate units. Stock regulators are either very old used parts or expensive NOS parts. Just make sure you buy a combined unit specifically designed for this style of charging system (they are available)
1982 KZ1000 Ltd

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1977 kz650 regulator rectifier upgrade 16 Nov 2022 11:56 #876901

  • riturbo
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Not sure if this helps but theres a few home made ones on louds page 



s3.amazonaws.com/gpzweb/index.html#home
Gpz 750 turbo The one I ride
Gpz 750 turbo Not finished
Gpz 750 turbo Not started
Gpz 550 1981
Gpz 550 1983
Bunch of other junk

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1977 kz650 regulator rectifier upgrade 16 Nov 2022 12:01 #876902

  • gd4now
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As I said I do not have the knowledge to tell you how, but like turbo gave a link here is one that Lou did provide  s3.amazonaws.com/gpzweb/RegRec/GPZvRegExciteField.html
1977 KZ650 B1
Pods and Denco header


This is my Z

OLD KAW OWNERS SMILE ALOT

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1977 kz650 regulator rectifier upgrade 16 Nov 2022 12:52 #876907

  • Nessism
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This company sells R/R units for bikes that use a field coil.   www.oregonmotorcycleparts.com/Reg_rec_units.html
Ed

Carburetor O-ring Kits For Sale: Mikuni VM & BS/CV, and Keihin CV34 (as used on KZ750E/H/N/Spectre, 400)

www.kzrider.com/forum/forum-index/faq-wi...owner-things-to-know

1981 KZ750E2
www.kzrider.com/forum/11-projects/604901...z750e-project-thread

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1977 kz650 regulator rectifier upgrade 17 Nov 2022 08:10 #876917

  • Wheelhop
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Rick's Electric sells a modern Regulator / rectifier combo 
1978 KZ 1000B (73 tribute)
1977 KZ1000 project
1976 KZ 900
1976 KV 75
1976 Honda Elsinore MT250
1974 Z1 900 project
1971 Honda CT70

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1977 kz650 regulator rectifier upgrade 17 Nov 2022 08:39 #876918

  • Nessism
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Rick's Electric sells a modern Regulator / rectifier combo 


Gotta be careful; the Rick's R/R is a three-phase jobby, not the type for a field coil.  
Ed

Carburetor O-ring Kits For Sale: Mikuni VM & BS/CV, and Keihin CV34 (as used on KZ750E/H/N/Spectre, 400)

www.kzrider.com/forum/forum-index/faq-wi...owner-things-to-know

1981 KZ750E2
www.kzrider.com/forum/11-projects/604901...z750e-project-thread

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1977 kz650 regulator rectifier upgrade 17 Nov 2022 09:05 #876919

  • Wookie58
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I believe this is the boy ? Although the 650 has a field coil style charging system it is still 3 phase


 
1982 KZ1000 Ltd
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1977 kz650 regulator rectifier upgrade 17 Nov 2022 13:06 #876928

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Humm, Type-B...  That doesn't come up when searching on their site for '77 KZ650.  It's good that they have one, though.
Ed

Carburetor O-ring Kits For Sale: Mikuni VM & BS/CV, and Keihin CV34 (as used on KZ750E/H/N/Spectre, 400)

www.kzrider.com/forum/forum-index/faq-wi...owner-things-to-know

1981 KZ750E2
www.kzrider.com/forum/11-projects/604901...z750e-project-thread
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